This is a simple but efficient tool to tune your guitar by reference. why not to use an automatic guitar tuner? sure you can, but this method helps to train your internal ear and this guitar tuner also helps you to tune your guitar beyond the standard tuning. User friendly, lightweight, with nice acoustic guitar sound. Inspired by the work of Taifun, and developed by a guitar player that understand the needs of guitar players, this app is the perfect tool for any guitar player. Keep your guitar in tune with this nice app.